DTM boss Gerhard Berger says the series must have privateer entries from 2019 onwards to create a ‘David v Goliath’ scenario.
The German touring car series is highly likely to drop down to just two manufacturers from next year, with Mercedes set to exit and take up their interest in Formula E.
This has left only Audi and BMW, though there are hopes that the cost-saving measure introduced this year, including a common aero package and simplified suspension, will attract independent teams to DTM.
Berger told Autosport that privateers are now essential: "It's a must, you need independent teams. You need this 'David vs Goliath', that is what fans like to see.
"I think we have the technical base for professional private teams to succeed and make a good result."
Audi head of motorsport Dieter Gass says that privateers are a feasible option.
"I think it [privateers] would need to be looked into for next year," he told Autosport.
"There are only two manufacturers so we need to improve the grid [and] it could be privateers.
"If you look at the cost concept it has become increasingly interesting over the past years, we have really significantly reduced the costs.
"Running a private team with up-to-date material is achievable these days and it could be interesting."
BMW's director of motorsport Jens Marquardt agrees: "I think it's definitely feasible, over the course of the last years since we have been involved the costs have come down massively," he told Autosport.
"When we joined I was told by the guys already there that the step made then was around 40%. Throughout the years we've been involved we've made another 30% or 40% reduction overall.
"We are on a good way and you can have private teams involved with a kind of technical support package. [The] David vs Goliath kind of set-up is a good one."